Locomotive-fire-box arch.



LE GRAND PARISH. LOCOMOTIVE FIRE BOX ARCH.

APPLICATION FILED JAN. 8,19l6.

Patented June 12, 1917.

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LE GRAND PARISH, or MOUNTAINVIEW. NEW innsngfz, essrenon TO AMERICAN ABCH COMPANY, or new YORK, n. Y., A CORPORATION or DELAWARE.

LOCOMOTIVE-FIREBOX ARCH.

Specification of Letters Patent.

Application filed January 8, 1916. Serial No. 71,061.

' To all whom it may concern:

lle it known that 1. Lu GRAN!) PARISH, a citizen of the United States, and a resident of l\lountainview, lassaic county, New Jersey, have invented certain new and useful Improvements in 'Locomotive-Fire-Box Arches, of which the following is a specification.

My invention relatesto improvements in refractory arches or baffles for locomotive boiler furnaces and has special reference toimprovements in the mounting of refractory arch bricks upon the water-circulating arch tubes of such boilers.

The material of wlnch arch brlcks aremade 1s highly abrasive; so much so, that as the metal arch tubes expand, contract and warp during usage. the coincidcntmovement of the refractory bricks upon the arch tubes wearsaway the portions of the tubes upon which the bricks rest. Not infrequently arch tubes are allowed to remain in the fireboxes until from these causes they are worn so thin as to burst under boiler pressure or collapse under the weight of the arch bricks. Doubtless the 'danger could be avoided by frequent inspection and replacement of the tubes; but the difficulty is that the tubes cannot be inspected without removing the arch bricks, and the amount of time and labor needed for that operation is such that it has becblne the practice to postpone inspection of the tops of the arch tubes until the time-of the removal of the bricks or until some clearly apparent fault in an arch tube makes the operation necessary.

The objects of my invention are, to avoid these dangers;-to make the frequent inspection of arch tubes unnecessary ;to avoid the heavy expense of tube replacements .due to the arch brick wear ;-and to prolongthe life of archtubes.

I accomplish thcseobjects by interposing a relatively permanent, but easily removable, wearing strip between each arch tube andevcry brick which rests upon it. I prefer that the wearing strips shall be composed of an asbestoid substance, capable of long withstanding the 'wear of the bricks, and

that the strips shall be held in place upon the tubes by means of a cement adapted to withstandthe high temperatures of the firebox.

My invention will be readily understood on reference to the accompanying drawings that form part of this specification, and in which: Figure l is a verticalcross-section of a locomotive firebox containing a front arch embodying my invention:Fig. 2 is a detailed view of the arch in a plane perpendicular to the inclined arch tubes Fig. 3 is a perspective detail still better illustrating the tube protecting or wearing str1ps;l+1g. i is a longitudinal view of tube and its wearing strip ;-and, Fig. 5 is an enlarged cross section thereof.

In Fig. l of the drawings, 2 represents the flue sheet of a locomotive boiler furnace or firebox. Typicalside sheets, 3, 3, and a typical crown sheet, 4, are shown.

The forwardly and downwardly inclined water-circidating metal arch tubes, 5 may .be of any desired number, shape and size.

They are. usually-spaced at equal distances and ordinarily are parallel. The marginal archbricks, (i, are supported by the outer tubes. 5, and the side sheets of the firebox. Intermediate arch bricks, 7, close the spaces between the several arch tubes. The wearing or protecting strips marked, A, are placed on the tops of the tubes and the several bricks-rest thereon instead of directly upon the tubes. As best shown, in Fig. 2, the arch bricks are of the sectional type, characterized by socketed ends, 8, shaped to fit the arch tubes. In many instances the bricks will be found to be of the kind shown in Fig. 3, that is, characterized by an inclined end, 9, formed to slide upon or against the supporting tube. Bricks of this character have but little movement on the tube at their socketed end, 8, and the movement of the inclined end, 9, against the arch tube is proportionally exaggerated. In the case of bricks which are socketed at both ends, as shown in Fig. 2,.the wear upon the tubes is practically equally divided. In the case of bricks having inclined ends, 9, the principal wear occurs at the tube against which the inclined tube rests. In either case I protect the top and sides of the tube by applying thereto a strip, A. This strip is curved to conform to the tube and, as shown, protects all parts of the tube which is likely to receive the wear of variously formed arch bricks. It will be noted that the bricks are arranged end to end in several horizontal rows. Each tube carries the ends of two bricks in the same horizon tal row, as best shown in Fig. 3.

Iprefer to fasten the wearing strips in place upon the tubes so that they shall not be dislodged in assembling the parts, or by relative movement of the bricks and tubes due to changes of temperature in the firebox.

()bviously, the wearing strips support the bricks and take the wear thereof, thus rclieving the metal tubes,.5, which it is important to preserve.

l have obtained the best results by employing asbestoid wearing strips, of a thickness approximating the thickness of the walls of'the arch tubes. Such material is a closely compacted, somewhat fibrous compositi-on, a'nd longg resists the wear of the rough contacting surfaces of the bricks. Mv further purpose in employin strips of such material will be apparent on observing that in the first wearing movements of the brick a portion of the asbestoid material is worn away and is in considerable part retained, as a filler by the rough surface of the brick. In this manner the contacting surface of the brick is provided With a smoother surface, chiefly composed of the same material as the strip; and thereby the body portion of the Wearing strip is largely relieved from the cutting effect of the abrasive brick surface. In Fig. 5, I have attempted to depict the manner in which the rough surface of the briclcend is thus filled and made relatively smooth by the gradual taking of material from the body of the wearing strip.

Infirst placing the strips upon the tubes l coat them with a suitable adhesive cement adapted to quite strongly attach the-asbestoid material to the metal surface of the tube and also adapted to resist decomposition at the temperatures attained by the 'ater filled arch tubes. I have not found it necessary to devise any new asbestoid material or any new cement, as several kinds oi each may be obtained in the open market under various commercial names.

supported by and between said-tubes. and

thin initially pliable wearing strips composed of material diiieringz; from both bricks and tubes, and adhesively attached to the tubes to receive the wear oi the bricks.

In testimony whereof, I have hereunto set my hand this 28th day of December, 1915.

LE GRAND PARISH. 

